We train ourselves to spot the headlights of Crown Vic cop cars from a half mile away, but how do we ID unmarked vehicles? Jalopnik readers are here to help, and they think they've found the stealthiest cop cars of all.

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Eventually, the sky will be ruled by unmanned vehicles in the dystopian drone future and none of these police-car-spotting skills will matter, but hopefully we'll all just be napping in cruise-controlled driverless cars by then anyway.

We limited this list to vehicles that are relatively new, so let us know in Kinja below about old secret unmarked cop cars used back in the day, like these Buick T-Types used in Connecticut. Sneaky.

9.) Smart Cars

We wouldn't say that Birmingham PD's two Smart cars are inconspicuous, but you're more inclined to think they're a joke than a real cop car. Over in Europe, these have been more common for years now, but they're still hilarious.

8.) Dodge Durangos

You just don't expect a Durango to be driven by anything other than a suburban mom ferrying her kids around. We're just not trained to spot them in speed traps. If they have push bars up front, that's something, but many don't even have those.

6.) Chevy Tahoes

The sheer ubiquity of Chevy Tahoes make them perfect unmarked cop cars. These things can be more common than minivans, and picking out the steelies and tints of a police-spec version is a challenge at highway speeds.

5.) Calgary Ford F-150s

For a lot of North America, there's no vehicle more common than a Ford F-150 with a tool box in the back. Again, you might expect these things to be running around as some department vehicle, but you'd never expect one to flash hidden lights and pull you over.

4.) Police Interceptor Ford Explorers

Unless you're close enough to spot the hidden lights in the grill, there's pretty much nothing you can do to ID a police-spec Explorer. Most of them that we've seen are in police livery, but in regular paint they look like nothing more than mommymobiles.

2.) Ford Mustangs

It seems to us like unmarked Mustangs are more common than you'd think. AOL Autos used one in their guide to unmarked cop cars, but we still never, ever expect to see a cop behind the wheel of a ‘Stang, at least on duty.

1.) Anything In Hawaii

In Hawaii, police officers can be allowed to use personal vehicles as their patrol cars. All they have is a detachable blue light on the roof to set them apart. Reader Mailbox Cancer has seen Saturn Ions, Toyota 4Runners, and even Chevy Cavaliers doing police duty. There's even this Infiniti G35 sedan, which is a first for us.

We're going to steer clear of breaking any law whatsoever in Hawaii, thank you very much.